1205 Variations...
I think the earliest iteration had the pigtail port for the power nozzle and a black metal face on the control panel. The next version had no pigtail port and the control panel was molded plastic. The fascia around the hose port on the first two iterations was light teal. Both of mine are the second iteration. At some point, the fascia changed to a darker teal to match the control panel. The next running change was the 'crinkled' finish and the final version was the 'Golden Jubilee' model, which got a gold color scheme and a redesigned handle. I believe it may have also received a different model number--1210 maybe?
There were also different power nozzle/hose/wand combinations. Most shipped with a PN1. I'm not sure whether any of them came with the PN1 permanently attached to the wand. The most common version was the fixed length wand with pigtail cords top and bottom. One of mine came with the Canadian style telescoping wand and early pistol grip hose. Later 1205's came with a PN2 as did the Golden Jubilee.
My information may be slightly off but I think it's mostly accurate.